DMFC Performance of Polymer Electrolyte Membranes Prepared from a Graft-Copolymer Consisting of a Polysulfone Main Chain and Styrene Sulfonic Acid Side Chains
DMFC Performance of Polymer Electrolyte Membranes Prepared from a Graft-Copolymer Consisting of a Polysulfone Main Chain and Styrene Sulfonic Acid Side Chains
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DOI：
10.3390/en9080658
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发表时间：
2016-08
期刊：
影响因子：
3.2
通讯作者：
N. Endo;Yoshiaki Ogawa;Kohei Ukai;Yuriko Kakihana;Mitsuru Higa
中科院分区：
文献类型：
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作者：
N. Endo;Yoshiaki Ogawa;Kohei Ukai;Yuriko Kakihana;Mitsuru Higa
以聚砜（PSF）为主链，聚苯乙烯磺酸（PSSA）为侧链，制备了不同平均侧链间距（Lav）和侧链长度（Lsc）的接枝共聚物（PSF-g-PSSA），制备了用于直接甲醇燃料电池（DMFC）的聚合物电解质膜（PEM）。采用原子转移自由基聚合（ATRP）方法，将对苯乙烯磺酸乙酯（EtSS）接枝到不同氯甲基含量的氯甲基化聚砜（CM）大分子引发剂上，通过改变共聚物中EtSS的含量合成了共聚物。使用具有三种类型的PEM的膜电极组件（MEA）的DMFC性能测试显示：由侧链平均距离（L av）短、L sc中等的接枝共聚物制备的PSF-g-PSSA PEM（SF-6）具有比长L av和长L sc或短L av和短L sc的PEM更高的DMFC性能，SF-6具有约两倍的PD max（68.4mW/cm 2）比在30wt%甲醇浓度下的Nafion ® 112更高。此外，它在50重量%的甲醇浓度下具有58.2mW/cm 2的PD max，因为它在所有PSF-g-PSSA PEM和Nafion ® 112的DMFC操作期间具有最高的质子选择性。
Polymer electrolyte membranes (PEMs) for direct methanol fuel cell (DMFC) applications were prepared from a graft-copolymer (PSF- g -PSSA) consisting of a polysulfone (PSF) main chain and poly(styrene sulfonic acid) (PSSA) side chains with various average distances between side chains ( L av) and side chain lengths ( L sc). The polymers were synthesized by grafting ethyl p -styrenesulfonate (EtSS) on macro-initiators of chloromethylated polysulfone with different contents of chloromethyl (CM) groups, and by changing EtSS content in the copolymers by using atom transfer radical polymerization (ATRP). The DMFC performance tests using membrane electrode assemblis (MEAs) with the three types of the PEMs revealed that: a PSF- g -PSSA PEM (SF-6) prepared from a graft copolymer with short average distances between side chains ( L av) and medium L sc had higher DMFC performance than PEMs with long L av and long L sc or with short L av and short L sc. SF-6 had about two times higher PD max (68.4 mW/cm 2 ) than Nafion ® 112 at 30 wt % of methanol concentration. Furthermore, it had 58.2 mW/cm 2 of PD max at 50 wt % of methanol concentration because of it has the highest proton selectivity during DMFC operation of all the PSF- g -PSSA PEMs and Nafion ® 112.